Hush Bubbles aerates up to 7-1/2 gallons and pumps 7/8 liters of air/minute. It runs quietly for 33 hours on two D- cell batteries and has a waterproof switch. The pump is protected by a weatherproof case, comes with weighted glass bead air stones and has large adjustable stainless steel mounting clips. Color: Stainless Steel. - $24.99